Machinery for cutting and mitering printers  rules



(Modem 28heets-Sheet 2.

O. MITCHELL- MACHINERY FOR CUTTING AND MITERING- PRINTERS RULES.

No. 271,349. Patented Ja11;30.1883.

Fz'y. 3.

N. PETERS, mfl um nikhen Wanhlngmn. cu; I 4

plan view.

llNITED STATES PATENT FFICE.

CHARLES MITCHELL, OF POUGHKEEPSIE, NEW YORK.

SPECIFICATION forining part of Letters Patent No. 271,349, dated January30, 1883,

' Application filed December 8, 1882. (Model) To all whom it may concernBe it known that 1, CHARLES MITCHELL, a citizen of the United States,residing at Poughkeepsie, county ofDutchess, and State of New York, haveinvented a new and usei'ullmprovement in Machines for Cutting andMitering Printers Rules, of which the following is a specification.

My invention relates to improvements in machines for cutting andmitering printers rules of the class cutting by a reciprocating motion,as distinguished from those working on the principle of a pair ofshears.

The objects of my invention are to obtain greater accuracy in cutting, asmoother out, and facility in working, combined with economy. 1 attainthese objects by the mechanism illustrated in the accompanying drawings,in which- Figure 1 is vertical side view of the entire machine; Fig. 2,a horizontal projection or Fig. 3,. an end view of the machine. Figs. 4and 5 detailed side views of the feed mechanism for cutting-tool, andFig. 6 adetailed view of mechanism for producing the reciprocatingmotion of the tablefor carrying the rule to be cut. Figs. 7 and 8 areside views of the reversible feeding-gage, showing the same in its twopositions. Fig. 9 is a side elevation of the cam by which the movementof the tool is effected.

Similarletters refer to similar parts throughout the several views.

A is the baseof the machine, of eitherwood or metal; A, the upper base,of metal B, the balance-wheel, secured to the shaft (J G and turningwith it in bearings D, attached to the frame A A.

The balance-wheel may be turned by hand, or, by adding a suitabledriving-pulley, may be driven by power.

The shaft 0 0 passes through and gives motion to the eccentric E, whichcommunicates a reciprocating motion, like that of a planingmachine, tothe table F, sliding on the ways G G, by meansof theeccentric-strap H,connecting-rod I, and the wrist-pin 1. The rule to be cut is placed inthe groove 06 a in the reciprocating table F and held firmly by theclamp J, whichis secured in any desired position by the adjusting-screwJ. The alternate to-andfro motion ot'the table F brings the rule againstthe cutting-tool K, and at each successive forward movement the cut isdeepened until the rule is entirely out through orthe bevel formed.

At each forward movement of the table F the cutting knife or tool mustbe fed down a distance depending on the nature of the metal to be cut.This is effected by the following mechanism:

Attached to the reciprocating table F is the piece of metal L, to whichisattached one end, of the rod M, passing through a spiral spring, at,and having its other end passing loosely through the lower extremity of'a lever, N,

and terminating in a nut or head, M, which rocks on ajournal, 0, andcarries at its upper end the pawl P, moving loosely on the pivot andworking in the teeth of the ratchet-wheel R, to which it gives astep-by-step movement of rotation. During the motion of the table Ftoward the tool K the rod M is pushed loosely through the hole in thestud attached to the lower end. of the lever N, and produces no effect;but the spring m, with which rod M is surrounded, pushes, owing to itscompression, with sufficient force against the stud, and causes theleverN to rock upon its pivot, and drags the pawlP loosely over theteeth of the ratchet-wheel until the lever N is stopped by the set-screwf. During the reverse movement of the table F from the tool K the rod Mpulls, by means of thenut M, the lower end of the lever N by a positivemotion with it. The pawl P thus pushes the ratchet-wheel around adistance equal to the width of one or more teeth, and carries thecam-wheel S, which is fast on the same shaft, with it. Upon this cam Srests the lever T, held againstthe cam by the spiral spring h, and fixedto the shaft V, which latter turns upon its conical bearings, which formpart of the screws H H. The forward end of the lever T has a head, V, towhich is attached the slotted tool-holder V. The tool K may be adjustedand firmly held in place by the set-screw V. The cam S thus gives a slowdownward movement to the cutting-tool, which takes a deeper and deepercut at each movement of the reciprocating table F toward it.

The cam S is constructed with a graduallydiminishing pitch as it recedesfrom the center for the greater. part of its circumference. Then a smallportion is of constant diameter, ending with a vertical drop to releasethe tool at the end of the operation.

IOC

In Fig. 9., 1, 2, and 3 indicate respectively those portions ofthecircumference which have the rapid or extreme pitch, the diminishingpitch, and the concentric surface,

The cam operates to give a downward feed at a gradually-dhninishingspeed to the tool K until the rule is nearly out through; thenfor'several strokes the tool is not fed down at all; and, finally, atthe completion of the cut, the end T falls down the vertical part of thecam S, and thus allows the cutter-head and tool to return to theirposition at the beginning of the work. By imparting to the pointed toola decreasing rate of feed the depth of its out is lessened as thesurface increases, and thus a uniform and easy action is secured. Byarresting the descent of the tool and holding the same stationary duringthe last few movements of the bed, the tool is caused to impart to thesurface of the metal a smoothness and accuracy of finish not otherwiseattainable.

The rate of feed may be regulated by the set-screwf, so as to feed oneor more teeth of the ratchet-wheel at pleasure.

The gage for determining the length of the rule out consists of a rod,1", extending horizontally from the side of the bed, audsustaining asliding collar, 25, to which there is attached by a vertical screw oneend of a gageplate, 19, the opposite end of which slides usually in thegroove a. in the face of the bed.

' The end of the rule bears against the end of the slide 19, and thedistance between the end of the slide and the cutter consequentlydetermines the' length of the rule.

The collar and slide may be moved forward and backward, and held inposition either by friction or by turning the connecting-screw downuntil it bears on the rod.

When rules of excessive length are to be cut the slidep may be reversedor turned end for end upon the screw, as shown in Fig. 8, thuspermitting the rule to extend outward against the collar.

If desired, this gageis made so as to be easily removed.

The clamp J is a simple piece of metal slotted to receive the screw J,and bent over slightly at the end toward the rule, so as to bear-on thecenter of the rule only.

I am aware of the patent granted to J. Stever, dated December 12, 1854,and numbered 12,076, and do not claim anything therein set forth orclaimed. 1

What I claim'as my invention, and desire to secure by Letters Patent, is

. 1. Incombinationwiththereeiprocatingbed, the vertically-rockingtool-carrier, and automatic means, substantially as described, forgradually depressing the tool-carrier.

2. In a machine for mitering printers rules, the combination of thereciprocating bed or carrier, the rocking head provided with the tool orcutter, the eccen tricto depress the head, and means, substantially asdescribed, acting to rotate the eccentric automatically. v

3. In combination with the reciprocating bed or carrier, the rockinghead provided with a cutter, and a cam to depress said head, constructedwith a diminishing pitch, whereby the tool is depressed with decreasingspeed as the depth of the cut increases.

4. The reciprocating bed, its actuating-rod and eccentric, incombination with the vertically-rocking tool-carrier, the cam to depressthe same, the pawl and ratchet to turn said cam, and operating devices,substantially as shown, connecting the pawl with the reciprocating bed.

5. In combination with the reciprocating bed or carrier, thevertically-movable tool-earrier, the cum to depress said carrier, thepawland'ratchetfeed to turn said cam, and the rod and spring connectingthe pawl-carrier with the reciprocating bed.

6. In combination with the cutter-supporting head, its depressingcam,the ratchetwheel, and the pawl and lever to turn said wheel, thereciprocating rod and spring to actuate the lever, and the adjustablestop to limit the backward motion of the lever, whereby the rod may becaused to move the cam and depress the' tool a greater orless distanceat each stroke.

7. In a machine for mitering rules, the combination of .a reciprocatingbed or carrier, a pivoted tool-carrying head, a spring tending to raisesaid head, and an automatically-actuated cam for depressing the head.

8. In combination with the movable bed or carrier, the tool-carrierpivoted in fixed bearings, the spring tending to elevate the carrier,and the depressing-cam provided with a shoulder or depression, wherebythe automatic elevation of the tool is effected when it has cut to thepredetermined depth.

9. In a machine for mitering printers rules, the combination of a bed orsupport for the rule, a cutter having a pointed cutting-end, andautomatic mechanism, substantially as described, adapted to depress saidtool at a diminishing speed as its out increases in depth, whereby thedepth of the cut is lessened as its surface is increased, thusequalizing the strain and insuring a smooth action.

10. In a machine for mitering printers rules, the combination, with thetool-carrying head,

of the. depressing-cam having its surface continued from the .point ofhighest elevation a limited distance in a concentric line, whereby thetool is permitted to remain in an unchanged position during itsfinishing cuts to impart a smooth surface to the metal.

11. In combination with the cutting-tool and the reciprocating bed orsupport, the rod r, the

sliding collar t thereon, and the plate 19, pivoted to the collar andadapted to be turned thereon end for end.

In witness of my said invention I hereunto set my hand this 25th day ofMay, A. D. 1882,.

. CHAS. MITCHELL. Witnesses:

.W. G. BUTTON, W. H. SONNEBORN.

